[syzbot] [jfs?] general protection fault in dtInsertEntry

From: syzbot
Date: Tue Apr 09 2024 - 02:23:05 EST

Hello,

syzbot found the following issue on:

HEAD commit: fe46a7dd189e Merge tag 'sound-6.9-rc1' of git://git.kernel..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=10056223180000
kernel config: https://syzkaller.appspot.com/x/.config?x=4d90a36f0cab495a
dashboard link: https://syzkaller.appspot.com/bug?extid=bba84aef3a26fb93deb9
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10548115180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=136ecbb5180000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/72ab73815344/disk-fe46a7dd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2d6d6b0d7071/vmlinux-fe46a7dd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/48e275e5478b/bzImage-fe46a7dd.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/06e004bee618/mount_0.gz

Bisection is inconclusive: the issue happens on the oldest tested release.

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1401ee15180000
final oops: https://syzkaller.appspot.com/x/report.txt?x=1601ee15180000
console output: https://syzkaller.appspot.com/x/log.txt?x=1201ee15180000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bba84aef3a26fb93deb9@xxxxxxxxxxxxxxxxxxxxxxxxx

loop0: detected capacity change from 0 to 32768
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 5061 Comm: syz-executor404 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:dtInsertEntry+0xd0c/0x1780 fs/jfs/jfs_dtree.c:3713
Code: 83 e6 02 31 ff e8 a4 3f 75 fe 83 e3 02 75 3a e8 9a 3c 75 fe 48 8b 9c 24 a8 00 00 00 48 83 c3 08 48 89 d8 48 c1 e8 03 4c 89 f2 <42> 0f b6 04 30 84 c0 74 3e 89 d9 80 e1 07 38 c1 7c 35 48 89 df e8
RSP: 0018:ffffc9000381f060 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: ffff88801a715a00
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000381f210 R08: ffffffff831fb7ac R09: ffffffff832296af
R10: 0000000000000004 R11: ffff88801a715a00 R12: ffff88807adfb130
R13: ffffffffffffffff R14: dffffc0000000000 R15: 000000000000000d
FS: 000055558fe16380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000066c7e0 CR3: 000000002ca48000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
dtInsert+0xbf1/0x6b00 fs/jfs/jfs_dtree.c:891
jfs_create+0x7ba/0xb90 fs/jfs/namei.c:137
lookup_open fs/namei.c:3497 [inline]
open_last_lookups fs/namei.c:3566 [inline]
path_openat+0x1425/0x3240 fs/namei.c:3796
do_filp_open+0x235/0x490 fs/namei.c:3826
do_sys_openat2+0x13e/0x1d0 fs/open.c:1406
do_sys_open fs/open.c:1421 [inline]
__do_sys_openat fs/open.c:1437 [inline]
__se_sys_openat fs/open.c:1432 [inline]
__x64_sys_openat+0x247/0x2a0 fs/open.c:1432
do_syscall_64+0xfb/0x240
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f30b7a475f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffd9c3bfb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fffd9c3c198 RCX: 00007f30b7a475f9
RDX: 000000000000275a RSI: 0000000020000080 RDI: 00000000ffffff9c
RBP: 00007f30b7ac0610 R08: 0000000000005e33 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fffd9c3c188 R14: 0000000000000001 R15: 0000000000000001
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dtInsertEntry+0xd0c/0x1780 fs/jfs/jfs_dtree.c:3713
Code: 83 e6 02 31 ff e8 a4 3f 75 fe 83 e3 02 75 3a e8 9a 3c 75 fe 48 8b 9c 24 a8 00 00 00 48 83 c3 08 48 89 d8 48 c1 e8 03 4c 89 f2 <42> 0f b6 04 30 84 c0 74 3e 89 d9 80 e1 07 38 c1 7c 35 48 89 df e8
RSP: 0018:ffffc9000381f060 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: ffff88801a715a00
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000381f210 R08: ffffffff831fb7ac R09: ffffffff832296af
R10: 0000000000000004 R11: ffff88801a715a00 R12: ffff88807adfb130
R13: ffffffffffffffff R14: dffffc0000000000 R15: 000000000000000d
FS: 000055558fe16380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557bf42357e0 CR3: 000000002ca48000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 83 e6 02 and $0x2,%esi
3: 31 ff xor %edi,%edi
5: e8 a4 3f 75 fe call 0xfe753fae
a: 83 e3 02 and $0x2,%ebx
d: 75 3a jne 0x49
f: e8 9a 3c 75 fe call 0xfe753cae
14: 48 8b 9c 24 a8 00 00 mov 0xa8(%rsp),%rbx
1b: 00
1c: 48 83 c3 08 add $0x8,%rbx
20: 48 89 d8 mov %rbx,%rax
23: 48 c1 e8 03 shr $0x3,%rax
27: 4c 89 f2 mov %r14,%rdx
* 2a: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 74 3e je 0x71
33: 89 d9 mov %ebx,%ecx
35: 80 e1 07 and $0x7,%cl
38: 38 c1 cmp %al,%cl
3a: 7c 35 jl 0x71
3c: 48 89 df mov %rbx,%rdi
3f: e8 .byte 0xe8


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup